Add Travis configuration file
Install pylint, pyflakes and sphinx
Install txgithub on Travis
On Python 2.5 use Twisted and zope.interface versions that works with Python 2.5

pip and easy_install currently can't select latest package version still
supported on current platform.
Disable pylint in Travis

Latest version doesn't work on Python 2.5 and currently Buildbot
doesn't pass pylint tests.
Install txgithub on Travis after Buildbot

Otherwise txgithub installs latest version of Twisted which doesn't work
on Python 2.5.
Disable txgithub on Travis

txgithub requires Twisted >= 12.3.0, which doesn't work on Python 2.5.
On Python 2.5 use Jinja2 version that works with Python 2.5

Python 2.5 support was dropped in 2.7 release:
<http://jinja.pocoo.org/docs/changelog/#version-2-7>
Add comment about mock on Travis
Install buildbot in first order to force installation of suitable versions for Python 2.5
Don't build documentation on Python 2.5
Install txgithub on Travis on Python > 2.5
Test on multiple versions of Twisted on Travis
Fix Travis YAML: ampersand have special meaning in YAML
On Python 2.5 force zope.interface version < 4.0.0
Disable Travis email notifications
Simpler check for Python version based on TRAVIS_PYTHON_VERSION environment variable
Add different versions of SQLAlchemy and -migration to Travis environment
Cleanup comments and empty lines
Fix syntax error